I don't Know who the "best" is or even how you would measure that, but here's my personal fav.
Muhammed Suiçmez
http://www.youtube.com/watch?v=Wt-9ZS9ViMo
yes its death metal, not alot of vocals on this vid so give it a try sissies
Chuck Schuldiner of death was a much better musician and songwriter, but not at guitar porn status like Muhammed